Tuesday, March 31, 2009

Knowing Lots of Facts

Knowing lots of facts absolutely matters in the real world. Having a good theoretical framework to organize them and logic (formal, informal, probablistic, or otherwise) to manipulate them help too - but not without real facts. Facts alone are worthless, you need good judgement too, but you cannot function at all without facts.

This is really only useful for non-factual arguments, where your emotions are more likely to interfere. You can prove ANYTHING if you can ignore disconfirming evidence. It reminds me of a point in decision making - almost all of our choices are over-determined; that is, there are always good reasons to do almost anything we may want to; to make a good decision we also have to balance the reasons not to choose particular things.

"What are the facts? Again and again and again - what are the facts? Shun wishful thinking, ignore divine revelation, forget what "the stars foretell," avoid opinion, care not what the neighbors think, never mind the unguessable "verdict of history" -- what are the facts and to how many decimal places? You pilot always into an unknown future; facts are your single clue. Get the facts!"-- Robert A Heinlein, Notebooks of Lazarus Long and Time Enough for Love

One must be ready to discard his own ideas and theories if new facts overturn them. I think knowing lots of facts is the simplest way to notice and correct for your own biases. You are more likely to notice a contradiction between what you have just decided and a previously known fact than you are to directly notice a bias in your thinking; even after setting the decision aside and coming back to it you are still more likely to notice a contradiction than a bias.